Process for making electric terminals



June 17,, 1924.

T. C. RUSSELL PROCESS FOR MAKING ELECTRIC TERMINALS Fiied Aug. 8, 1923 INVENTOR.

& TTORNEYS. I

reams June 17,1924.

[ran STATES THOMAS C. BfiSSIEEL, OF CHICAGO, ILLINOIS.

PROGES FOR MAKING ELECTRIC TERMINALS.

Application filed August 8, 1928. Serial No. 658,839.

To all wi'wm it may concern.

Be it known that l, THOMAS C. Rosanna, a citizen of the United States, and a resident of Chicago, int the county of Cook and State of Illinois, have invented certain new and useful Improvements in Processes for Making Electrlc 'lerm'inals, of which the following is a specification.

My invention relates to electric terminals and process for making same. The terminals to which my invention particularly apies are provided on electric heating devices from which they project to be receivedby terminal jaws in connecting lugs. Terminals in the form of a cylinrical in, and flatblades have been used, and eac terxniml is usually provided with a threaded shank by means of which the terminals may be secured to a support and which shank also receives clam ing nuts for electrically connecting with t e terminals the ends of the resistance wire or element of the electric heating device. The diameter of the shanks is usually much eater than the thickness of the blades and heretofore it has required considerable labor andex se to manufacture such bladeterminals t ey having been usually food and finished from stockv which has originally the thickness of the shank 3 diameter.

The main object of m invention is to make the blade terminals om a single piece of thin sheet metal and to provide improved recedure for transiormin the originally fl at shank portion into a cylindrical shank of the proper diameter. In accordance with my invention l stp the blank for a terminal from sheet metal, the blank comprising the plug receiving blade section and the flat shank section, and then in a suitable die, I traersely curl or bend the flat shank section and compress it to substantially cylindrical form, there being enough metal left in the blank along the edges of the flat ank section so that in the finished cylindrical sh there will be sufiicient metal to bring it to the desired diameter. The shank section can be threaded after formation, or

' threads can be applied simultaneously with so the iorming operation.

My invention will he clearly understood by reference to the accompanying drawing, in which ljig. 1 is e.- side elevational view of a te and the part 1 secti n,

Fi a

fieferring to Fig. 1 the finished terminal comprises the rectan lar blade section 10, the substantially cylindrical shank section 11, and the extensions 12 and 13 at the base of the blade section forming abutments or seating shoulders for the terminal. 14 represents a section of the wall of an electric heating device and has the openin 15 and 16 through which the shanks of t e. termmals extend, there being two terminals placed side by side as shown in Fig. 2 for receiving the terminal jaws of a connecting lplug. On the outside of the wall 14 a meta ic Washer 17 receives the shank just below the shoulders 12 and 13, the shank at this point being flat and rectangular. Between this washer and the'wall 14 is inserted a washer 18 of insulating material. Receiving shank on the inside of the wall is the metalllc washer 19 between which and the wall is inserted a washer 20 of insulating materml which has the extension 21 which engages 1n the opening 15.- A nut 22 threads on to the shank and against the washer 19 and the terminal is thus rigidlysecured to the wall 14. Between the nut 22 and the nut 23 15 secured one of the terminals of the electric heating wire or element forming part of the electric heating device. The outer end 24 o! the blade is beveled ofi in order that the terminal may more readily receive the plug yaw.

Fig. 3 shows the flat blank stamped from sheetmeta'l and this blank comprlses the blade section 25, and the flat shank section .26, the blade section being the same as. the.

blade 10 of the finished terminal when the. m5

beveled end 24 has been formed thereon. en the blank is stamped extra metal 27 and 28 is left along the edges so that there be suficient metal to form the fimshed ank to the proper diameter. blank thus 11 f rm d It as su cted After the.

section is bent or curled transversel to another die operation in which the shankl an com ressed to substantially cylindrica form as s own in the cross section of Fig. the two halves of the blade being each formed to substantially semi-cylindrical form and broughttogether to form the finished shank. The extra metal 27 and 28 will brin the shank to the proper diameter an threading 29 can be applied thereto by the same die that forms the shank, or the shank can be threaded by machine or by tools after it has been formed.

Although the shank when formed in the die does not quite form a complete cylinder, it is sufiiciently close to cylindrical form to be sufiicientl threaded to securely hold nuts thereon.- The section 30 of the shank just below the shoulders 12 and 13 remains flat and this section receives the abutment washer 17 as shown in Fig. 1.

I thus roduce a simple, inex ensive terminal which can be constructe by simple die 0 erations from stock sheet metal which may brass, iron, steel or any other suitable metal.

Having described follows:' 1. The

my invention, I claim as process of forming an electrical It terminal of the class described which conthe sists in stamping from a flat iece of sheet metal a blank comprising a lade section 1 sists in stamping from a flat piece of sheet metal a blank comprising a blade section and a shank section extending therefrom, then transversely upsetting and curling over the shank section to substantially cylindrical form and of a diameter greater than the thickness of the blade section, and providing threadingons'aid shank section.

The process of, forming an electrical terminal of the class described which consists in stam ing of a fiat piece of'sheet metal a blan comprising a blade section and an embryo shank section extending therefrom, then bendin the sides of the shank section toward eac other along a median line and compressin them to form the substantially c lindrical' ished shank, and threading su shank.

In witness whereof, Ihereunto subscribe my name this 11th day of Jul A. D., 1923.

THOMAS C. USSELL.

and a shank section extending therefrom, 

